Main.css

@import url('https://fonts.googleapis.com/css?family=Droid+Serif|Merriweather|Raleway|Raleway+Dots');
body{
	margin:0;
	padding:0;
    background: #2980b9 url('imageStatic.png') repeat 0 0;
	-webkit-animation: 10s linear 0s normal none infinite animate;
	-moz-animation: 10s linear 0s normal none infinite animate;
	-ms-animation: 10s linear 0s normal none infinite animate;
	-o-animation: 10s linear 0s normal none infinite animate;
	animation: 10s linear 0s normal none infinite animate;
 
}
 
@-webkit-keyframes animate {
	from {background-position:0 0;}
	to {background-position: 500px 0;}
}
 
@-moz-keyframes animate {
	from {background-position:0 0;}
	to {background-position: 500px 0;}
}
 
@-ms-keyframes animate {
	from {background-position:0 0;}
	to {background-position: 500px 0;}
}
 
@-o-keyframes animate {
	from {background-position:0 0;}
	to {background-position: 500px 0;}
}
 
@keyframes animate {
	from {background-position:0 0;}
	to {background-position: 500px 0;}
}
html, body {
  height: 100%;
}


#intro {
  height: 40%;
  top: 40%;
  text-align: center;
  line-height: 20px;
  margin-left: 30px;
  margin-right: 30px;
  margin-top: 80px;
}
.intro--inside{
  margin-top: 0px;
  line-height: 0px;
  padding-bottom: 20px;
}
h1 {
  font-size: 60px;
  letter-spacing: 0.015em;
}
h1::after {
  content: '';
  width: 100px;
  display: block;
  background: pink;
  height: 3px;
  margin: 30px auto;
  line-height: 1.1;
}
p {
  align-self: center;
  font-size: 13px;
  padding-bottom: 20px;
  font-family: Droid Serif;
}
.btn {
  display: inline-block;
  margin: 12px;
  padding: 12px 30px;
  border: 1px solid #fff;
  text-transform: uppercase;
  letter-spacing: 0.015em;
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
  color: #fff;
  border-radius: 50px;
  text-decoration: none;
  -webkit-transition: all 0.8s;
     -moz-transition: all 0.8s;
       -o-transition: all 0.8s;
          transition: all 0.8s;
}
.btn:hover {
  color: yellow;
  border-color: yellow;
}
.btn1:hover {
  color: #8817ff;
  border-color: #8817ff;
}
.btn2:hover {
  color: #1074ff;
  border-color: #1074ff;
}
.btn3:hover {
  color: #fda83f;
  border-color: #fda83f;
}
.btn4:hover {
  color: #4aff01;
  border-color: #4aff01;
}
@media only screen and (max-width: 1000px) {
  h1 {
    font-size: 70px;
  }
}

@media only screen and (max-width: 800px) {
  h1 {
    font-size: 48px;
  }
  h1::after {
    height: 8px;
  }
}

@media only screen and (max-width: 568px) {
  #intro {
    padding: 0 10px;
  }
  h1 {
    font-size: 30px;
  }
  h1::after {
    height: 6px;
  }
  p {
    font-size: 18px;
  }
  .btn {
    font-size: 16px;
  }
}

@media only screen and (max-width: 320px) {
  h1 {
    font-size: 28px;
  }
  h1::after {
    height: 4px;
  }
}